Consumer Unit Replacement in the UK: Everything You Need to Know

Introduction

Thinking about replacing your old fuse box? You're not alone. Upgrading to a modern consumer unit is one of the most important electrical improvements you can make in your home. Whether you're renovating, buying an older property, or concerned about safety, a consumer unit replacement in the UK ensures your electrical system meets current safety standards — and protects your family, tenants, and property.

In this guide, we'll explain what a consumer unit is, when and why you should replace it, how much it costs, and what UK regulations apply.

What Is a Consumer Unit?

A consumer unit, commonly known as a fuse box, is the control centre for your home's electrical system. It distributes electricity across all circuits and includes essential safety features like:

• Circuit breakers
  
  

• Residual Current Devices (RCDs)
  
  

• Miniature Circuit Breakers (MCBs)
  
  

• Surge Protection Devices (SPDs) (optional but recommended)
  
  

Modern consumer units are designed to instantly cut off power in the event of a fault, reducing the risk of fire, electrical shock, and damage to appliances.

When Should You Replace Your Consumer Unit?

You should consider a fuse box upgrade if:

• Your current unit has rewireable fuses or is outdated
  
  

• You’re experiencing frequent trips or blown fuses
  
  

• Your home is being rewired or renovated
  
  

• You’re installing EV chargers, electric heating, or solar panels
  
  

• You’re a landlord complying with safety regulations
  
  

Older fuse boxes often lack RCD protection, which is now a mandatory safety standard under UK wiring regulations.

UK Regulations for Consumer Unit Replacement

Consumer unit upgrades must comply with:

• BS 7671: 18th Edition Wiring Regulations
  
  

• Part P of the Building Regulations (England and Wales)
  
  

• Electrical Safety Standards in the Private Rented Sector (England) Regulations 2020 for landlords
  
  

This means the work must be carried out by a qualified electrician, preferably one who is registered with NICEIC or NAPIT. Upon completion, you'll receive:

• Electrical Installation Certificate (EIC)
  
  

• Part P Building Compliance Certificate (if applicable)
  
  

How Much Does a Consumer Unit Replacement Cost in the UK?

The average cost to replace a consumer unit in the UK in 2025 ranges from:

• £450 to £850 for a standard 10-way consumer unit
  
  

• £850 to £1,200+ for larger homes or custom installations
  
  

Factors Affecting Cost:

• Number of circuits
  
  

• Complexity of installation
  
  

• Location and accessibility
  
  

• Need for additional upgrades (e.g., main bonding or rewiring)
  
  

TIP: Always get at least 2–3 quotes from Part P registered electricians and ensure it includes labour, parts, testing, and certification.

What to Expect During the Replacement

Step-by-Step Process:

1. Initial inspection – Your electrician assesses the existing setup and checks for any wiring faults.
   
   

2. Power shutdown – All power is turned off for safety.
   
   

3. Old unit removal – The old fuse box is safely disconnected and removed.
   
   

4. New consumer unit installation – The new unit is installed and connected to circuits.
   
   

5. Full testing – The electrician conducts insulation resistance, continuity, and RCD tests.
   
   

6. Certification and notification – You receive the EIC and a Part P notification is sent to your local authority (if applicable).
   
   

Duration: Usually 4 to 8 hours, depending on the complexity.

Benefits of Replacing Your Consumer Unit

✅ Improved safety – RCDs and MCBs reduce fire and electrocution risks
✅ Compliance with modern standards – Essential for selling or renting a home
✅ Future-proofing – Supports modern appliances and smart technologies
✅ Insurance approval – Some policies may require modern electrical systems
✅ Peace of mind – Reduces the risk of costly electrical faults

Do Landlords Need to Replace Old Consumer Units?

Yes, if the current fuse box does not comply with the Electrical Safety Standards in the Private Rented Sector. All rental properties in England must have a satisfactory EICR (Electrical Installation Condition Report) every 5 years, and most failing reports recommend a consumer unit upgrade.

Choosing the Right Electrician

Make sure your installer is:

• Registered with a UK competent person scheme (NICEIC, NAPIT)
  
  

• Able to provide certificates of compliance
  
  

• Experienced in domestic consumer unit upgrades
  
  

• Willing to show previous work and client reviews
  
  

You can verify registration on the Electrical Competent Person Register: https://electricalcompetentperson.co.uk/

Conclusion

Replacing an old fuse box with a modern 18th Edition consumer unit is a smart, future-proof investment in your property’s safety. Whether you're a homeowner or landlord, staying compliant with UK electrical standards helps protect lives — and your finances.

Need a quote or free inspection? Search online for "consumer unit replacement near me UK" or consult a Part P registered electrician in your area today.

https://www.electricalsafetyfirst.org.uk/media/1203/best-practice-guide-1-issue-3.pdf